[issue44310] Document that lru_cache uses hard references

[Henk-Jaap Wagenaar]

Henk-Jaap Wagenaar <wagenaarhenkjaap at gmail.com> added the comment:

(but consenting adults, setting max_size=None for "efficiency", you better be sure what you are doing in a long running process and making sure it cannot grow unbounded.)

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<https://bugs.python.org/issue44310>
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